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Related Concept Videos

Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Potential Energy00:52

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The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy.
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A conservative force, such as a gravitational or elastic force, gives the body the capacity to do work. This capacity, measured as the potential energy, depends on the body's location or “position” relative to a fixed reference position or datum. The gravitational potential energy is considered zero at the reference point. Suppose a body is located at some vertical distance above a fixed horizontal reference or datum. In that case, the weight of the body has positive gravitational potential...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Thermodynamics of a Redox Reaction
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Thin-layer Chromatographic TLC Separations and Bioassays of Plant Extracts to Identify Antimicrobial Compounds
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Macroalgae Extracts From Antarctica Have Antimicrobial and Anticancer Potential.

Rosiane M Martins1, Fernanda Nedel2, Victoria B S Guimarães2

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Frontiers in Microbiology
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Antarctic macroalgae extracts show promise as therapeutic agents. One extract demonstrated potent antifungal activity, while another exhibited significant cytotoxicity against cancer cells with minimal impact on normal cells.

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Area of Science:

  • Marine Biology
  • Pharmacology
  • Bioprospecting

Background:

  • Antarctic macroalgae synthesize diverse bioactive compounds.
  • Extreme Antarctic conditions may drive unique metabolite production.
  • Biodiversity and bio-prospecting potential of Antarctic macroalgae are underexplored.

Purpose of the Study:

  • Evaluate antimicrobial and cytotoxic activities of Antarctic macroalgae extracts.
  • Investigate potential therapeutic applications of these natural products.
  • Assess selectivity against cancer versus normal cell lines.

Main Methods:

  • Sequential solvent extraction of four Antarctic macroalgae species.
  • Broth microdilution method for antimicrobial activity assessment.
  • MTT colorimetric assay for cytotoxicity evaluation against cancer and fibroblast cell lines.

Main Results:

  • Ethyl acetate extract of *Himantothallus grandifolius* displayed broad-spectrum antifungal activity, including against fluconazole-resistant strains.
  • Ethyl acetate extract of *Iridaea cordata* showed high cytotoxicity (95.6% inhibition) against the A-431 cancer cell line after 48h.
  • Most macroalgae extracts exhibited low cytotoxicity against normal mouse embryonic fibroblasts (NIH/3T3).

Conclusions:

  • Antarctic macroalgae represent a valuable source of novel therapeutic agents.
  • Specific extracts possess significant antimicrobial and anticancer properties.
  • Potential for developing targeted cancer therapies and antifungal treatments from marine sources.